/*++

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Abstract:

NMR_ImportStream_Memory.h defines the CImportStream_Memory Class.
This is an abstract platform independent class for keeping data in a memory stream.

--*/

#ifndef __NMR_IMPORTSTREAM_MEMORY
#define __NMR_IMPORTSTREAM_MEMORY

#include "Common/Platform/NMR_ImportStream.h"
#include "Common/NMR_Types.h"
#include "Common/NMR_Local.h"

#define NMR_IMPORTSTREAM_READCHUNKSIZE (1024*1024)

#define NMR_IMPORTSTREAM_MAXMEMSTREAMSIZE (1024ULL*1024ULL*1024ULL*1024ULL)

namespace NMR {

	class CImportStream_Memory : public CImportStream {
	protected:
		nfUint64 m_cbSize;
		nfUint64 m_nPosition;
		
		virtual const nfByte * getAt(nfUint64 nPosition) = 0;
	public:
		virtual ~CImportStream_Memory();

		virtual nfBool seekPosition(_In_ nfUint64 nPosition, _In_ nfBool bHasToSucceed);
		virtual nfBool seekForward(_In_ nfUint64 cbBytes, _In_ nfBool bHasToSucceed);
		virtual nfBool seekFromEnd(_In_ nfUint64 cbBytes, _In_ nfBool bHasToSucceed);
		virtual nfUint64 getPosition();
		virtual nfUint64 readBuffer(_In_ nfByte * pBuffer, _In_ nfUint64 cbTotalBytesToRead, nfBool bNeedsToReadAll);
		virtual nfUint64 retrieveSize();
		virtual void writeToFile(_In_ const nfWChar * pwszFileName);
		virtual PImportStream copyToMemory() = 0;
	};

}

#endif // __NMR_IMPORTSTREAM_MEMORY
